How to Call a Generic Method with a Runtime-Determined Type Argument?

Calling Generic Method with a Type Argument Known Only at Execution Time

Problem: Dynamically Calling Generic Method

You want to invoke a generic method with a type argument that is not known until runtime. For instance, you have a list of interfaces, and you want to call a generic method for each interface.

Solution: Reflection-Based Dynamic Invocation

Since the type argument is not known at compile time, you cannot use traditional method invocation with generics. Instead, you need to use reflection to dynamically invoke the generic method based on the type argument obtained at runtime.

Here's how you can implement this approach:

1. Get the Generic Method: Use Type.GetMethod to retrieve the generic method.
2. Construct Generic Type Argument: Use Type.GetTypeArguments to identify the generic type parameter. Then, create a Type object representing the actual type argument you want to use.
3. Create Generic Method Instance: Use MakeGenericMethod on the generic method to create a specific instance of it with the given type argument.
4. Invoke Generic Method: Finally, use Invoke on the created generic method instance to invoke it dynamically.

Example in Code

// Original Method
public void Method<T>() {
    // Method body
}

// Main Method
var assembly = Assembly.GetExecutingAssembly();
var interfaces = assembly.GetTypes().Where(t => t.Namespace == "MyNamespace.Interfaces");

foreach (var interfaceType in interfaces) {
    MethodInfo genericMethod = typeof(Test).GetMethod("Method");
    MethodInfo specificMethod = genericMethod.MakeGenericMethod(interfaceType);
    specificMethod.Invoke(null, null); // No arguments for this example
}

By utilizing reflection, this approach allows you to dynamically call the generic method with unknown type arguments at runtime.

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